Metamaterial CRLH Structure-based Balun for Common-Mode Current Indicator

Abstract

--We proposed a new PCB-type 'common-mode current(I c ) and differential-mode current(I d ) detector' working for fast detection of I c and I d from the differential-mode signaling, with miniaturization effect and possibility of cheaper fabrication. In order to realize this device, we suggest a branch-line-coupler balun having a composite right-and left-handed(CRLH) one-layer microstrip phase-shifting line as compact as roughly λ g /14. The presented balun obviously is different from the conventional bent-&-folded delay lines or slits on the ground for coupling the lines on the top and bottom dielectrics. As we connect the suggested balun output ports of the differential-mode signal lines via the through-port named U and coupled-port named L, I c and I d will appear at port Δ and port Σ of the present device, in order. The validity of the design scheme is verified by the circuit-and numerical electromagnetic analyses, and the dispersion curve proving the metamaterial characteristics of the geometry. Besides, the examples of the I c and I d indicator are observed as the even and odd modes in differential-mode signal feeding. Also, the proposed device is shown to be very compact, compared with the conventional structure.

A Fully-Printed CRLH Dual-Band Dipole Antenna Fed by a Compact CRLH Dual-Band Balun

“…It is a matter of course, the zeroth-order resonance (ZOR) should also be created around ( f 1 + f 2 )/2 for the size-reduction. So, the mathematical equations for C R , C L , L R and L L are as follows [ 22 , 23 ]. Others end up with multiple stages, but a single-stage circuit is proposed here to reduce the size.…”

“…Kahng et al proposed a CRLH-based balun for common-mode current indicator which is employed in the chip and PCB EMC (Printed circuit board electromagnetics compatibility) problems. The balun consists of the branch-line coupler and the compact metamaterial phase shifters that are horizontally cascaded [ 22 ]. It works for a single band.…”

Semi-lumped Balun Transformer using Coupled LC Resonators

“…Many RF circuit modules and systems adopt a balanced input and output in order to improve the dynamic range by reducing the noise and even order harmonics [1][2][3][4][5][6]. As these RF modules and systems advance to be become smaller, lighter, and multi-functional with better performance, they generate a strong need for compact sized wideband balun devices [3][4][5][7][8][9][10][11][12][13][14][15][16][17].…”